1.

If half-life of a certain radioactive nucleus is 1000s. the disintegration constant is

Answer»

`6.93 xx 10^(2) s^(-1)`
`6.93 xx 10^(-4)s`
`6.93 xx 10^(-4) s^(-1)`
`6.93 xx 10^(3) s`

SOLUTION :`K = (0.693)/(t_(1//2)) = (0.693)/(1000S) = 0.000693 = 6.93 xx 10^(-4) s^(-1)`


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